org.apache.drill.exec.physical.impl.xsort

Enum ExternalSortBatch.Metric

java.lang.Object

java.lang.Enum<ExternalSortBatch.Metric>

org.apache.drill.exec.physical.impl.xsort.ExternalSortBatch.Metric

All Implemented Interfaces:

Serializable, Comparable<ExternalSortBatch.Metric>, MetricDef

Enclosing class:

ExternalSortBatch

public static enum ExternalSortBatch.Metric
extends Enum<ExternalSortBatch.Metric>
implements MetricDef

Enum Constant Summary

Enum Constants

Enum Constant and Description
MERGE_COUNT The number of second+ generation merges.
MIN_BUFFER The minimum memory level (in bytes) observed in operation.
NOT_USED Was: peak value for totalSizeInMemory But operator already provides this value.
PEAK_BATCHES_IN_MEMORY The maximum number of batches kept in memory.
SPILL_COUNT The number of times operator spilled to disk.
SPILL_MB The number of MB of data spilled to disk.

Method Summary

Modifier and Type	Method and Description
int	metricId()
static ExternalSortBatch.Metric	valueOf(String name) Returns the enum constant of this type with the specified name.
static ExternalSortBatch.Metric[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.drill.exec.ops.MetricDef

name

Enum Constant Detail

SPILL_COUNT

public static final ExternalSortBatch.Metric SPILL_COUNT

The number of times operator spilled to disk.

NOT_USED

public static final ExternalSortBatch.Metric NOT_USED

Was: peak value for totalSizeInMemory But operator already provides this value. Cannot remove this value: doing so would throw off the numeric indexes in the query profile.

PEAK_BATCHES_IN_MEMORY

public static final ExternalSortBatch.Metric PEAK_BATCHES_IN_MEMORY

The maximum number of batches kept in memory.

MERGE_COUNT

public static final ExternalSortBatch.Metric MERGE_COUNT

The number of second+ generation merges.

MIN_BUFFER

public static final ExternalSortBatch.Metric MIN_BUFFER

The minimum memory level (in bytes) observed in operation. Not as interesting as it seems: this class aggressively manages memory to keep this number positive.

SPILL_MB

public static final ExternalSortBatch.Metric SPILL_MB

The number of MB of data spilled to disk. This amount is first written, then later re-read. So, disk I/O is twice this amount.

Method Detail

values

public static ExternalSortBatch.Metric[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (ExternalSortBatch.Metric c : ExternalSortBatch.Metric.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static ExternalSortBatch.Metric valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

metricId

public int metricId()

Specified by:

metricId in interface MetricDef